An interface for database load monitoring. More...
Public Member Functions | |
| __construct ($parent) | |
| Construct a new LoadMonitor with a given LoadBalancer parent. | |
| getLagTimes ($serverIndexes, $wiki) | |
| Return an estimate of replication lag for each server. | |
| postConnectionBackoff ($conn, $threshold) | |
| Perform post-connection backoff. | |
| scaleLoads (&$loads, $group=false, $wiki=false) | |
| Perform pre-connection load ratio adjustment. | |
Detailed Description
An interface for database load monitoring.
Definition at line 14 of file LoadMonitor.php.
Constructor & Destructor Documentation
| LoadMonitor::__construct | ( | $ | parent | ) |
Construct a new LoadMonitor with a given LoadBalancer parent.
- Parameters:
-
LoadBalancer $parent
Implemented in LoadMonitor_MySQL, and LoadMonitor_Null.
Member Function Documentation
| LoadMonitor::getLagTimes | ( | $ | serverIndexes, |
| $ | wiki | ||
| ) |
Return an estimate of replication lag for each server.
- Parameters:
-
$serverIndexes $wiki
- Returns:
- array
Implemented in LoadMonitor_MySQL, and LoadMonitor_Null.
| LoadMonitor::postConnectionBackoff | ( | $ | conn, |
| $ | threshold | ||
| ) |
Perform post-connection backoff.
If the connection is in overload, this should return a backoff factor which will be used to control polling time. The number of threads connected is a good measure.
If there is no overload, zero can be returned.
A threshold thread count is given, the concrete class may compare this to the running thread count. The threshold may be false, which indicates that the sysadmin has not configured this feature.
- Parameters:
-
$conn DatabaseBase $threshold Float
Implemented in LoadMonitor_MySQL, and LoadMonitor_Null.
| LoadMonitor::scaleLoads | ( | &$ | loads, |
| $ | group = false, |
||
| $ | wiki = false |
||
| ) |
Perform pre-connection load ratio adjustment.
- Parameters:
-
$loads array $group String: the selected query group $wiki String
Implemented in LoadMonitor_MySQL, and LoadMonitor_Null.
The documentation for this interface was generated from the following file:
- includes/db/LoadMonitor.php
